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.TH _LONGJMP 3C "Jul 24, 2002"
.SH NAME
_longjmp, _setjmp \- non-local goto
.SH SYNOPSIS
.LP
.nf
#include <setjmp.h>

\fBvoid\fR \fB_longjmp\fR(\fBjmp_buf\fR \fIenv\fR, \fBint\fR \fIval\fR);
.fi

.LP
.nf
\fBint\fR \fB_setjmp\fR(\fBjmp_buf\fR \fIenv\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fB_longjmp()\fR and \fB_setjmp()\fR functions are identical to
\fBlongjmp\fR(3C) and \fBsetjmp\fR(3C), respectively, with the additional
restriction that \fB_longjmp()\fR and \fB_setjmp()\fR do not manipulate the
signal mask.
.sp
.LP
If \fB_longjmp()\fR is called even though \fBenv\fR was never initialized by a
call to \fB_setjmp()\fR, or when the last such call was in a function that has
since returned, the results are undefined.
.SH RETURN VALUES
.sp
.LP
Refer to \fBlongjmp\fR(3C) and \fBsetjmp\fR(3C).
.SH ERRORS
.sp
.LP
No errors are defined.
.SH USAGE
.sp
.LP
If \fB_longjmp()\fR is executed and the environment in which \fB_setjmp()\fR
was executed no longer exists, errors can occur. The conditions under which the
environment of the \fB_setjmp()\fR no longer exists include exiting the
function that contains the \fB_setjmp()\fR call, and exiting an inner block
with temporary storage. This condition might not be detectable, in which case
the \fB_longjmp()\fR occurs and, if the environment no longer exists, the
contents of the temporary storage of an inner block are unpredictable. This
condition might also cause unexpected process termination. If the function has
returned, the results are undefined.
.sp
.LP
Passing \fBlongjmp()\fR a pointer to a buffer not created by \fBsetjmp(\|),\fR
passing \fB_longjmp()\fR a pointer to a buffer not created by \fB_setjmp()\fR,
passing \fBsiglongjmp\fR(3C) a pointer to a buffer not created by
\fBsigsetjmp\fR(3C) or passing any of these three functions a buffer that has
been modified by the user can cause all the problems listed above, and more.
.sp
.LP
The \fB_longjmp()\fR and \fB_setjmp()\fR functions are included to support
programs written to historical system interfaces.  New applications should use
\fBsiglongjmp\fR(3C) and \fBsigsetjmp\fR(3C) respectively.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.sp
.LP
.BR longjmp (3C),
.BR setjmp (3C),
.BR siglongjmp (3C),
.BR sigsetjmp (3C),
.BR attributes (7),
.BR standards (7)
